Hydrochloric Acid → 2-(Pyridin-4-yl)aniline

Temperatur

25 °C

To a 500 mL round-bottomed flask was added a solution of 4-(2-nitrophenyl)-pyridine (Step a) (7.1 g, 36 mmol) in MeOH (300 mL). The solution was treated dropwise with concd HCl (6.7 mL, 84 mmol) and purged with N2. Pd/C (10%, Aldrich) (2.5 g) was added, H2 was introduced and the suspension was magnetically stirred under atmospheric H2 pressure for 15 h at 25° C. The suspension was purged with N2, filtered through Celite® (Aldrich) (25 g) and the filter cake was washed with MeOH (400 mL). The filtrate was concentrated in vacuo to a yellow powder which was partitioned between EtOAc (200 mL) and 1 N NaOH (100 mL). The organic layer was washed with water (100 mL), satd NaCl (50 mL), dried over Na2SO4, filtered and concentrated in vacuo to afford the title compound as a viscous yellow oil which solidified upon standing (6.0 g). MP 81-83° C. MS (ESI, pos. ion) m/z: 171 (M+1); (ESI, neg. ion) m/z: 169 (M−1). Calc'd for C11H10N2: 170.21.

1. custompurged with N2
2. additionPd/C (10%, Aldrich) (2.5 g) was added
3. additionH2 was introduced
4. customThe suspension was purged with N2
5. filtrationfiltered through Celite® (Aldrich) (25 g)
6. washthe filter cake was washed with MeOH (400 mL)
7. concentrationThe filtrate was concentrated in vacuo to a yellow powder which
8. customwas partitioned between EtOAc (200 mL) and 1 N NaOH (100 mL)
9. washThe organic layer was washed with water (100 mL), satd NaCl (50 mL)
10. dry with materialdried over Na2SO4
11. filtrationfiltered
12. concentrationconcentrated in vacuo

ORD-Eintrag

ord-11a10a81a4fd47138ff59eb4e2a4ee3e

Quelldatensatz

uspto-grants-2005_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06977264B2